If you go with the cheapest option you wi'll be unlikely to get any future updates, but if your really cheap get one of the clones, just make sure you only usr the safe firmware files though
you are asking for a superhero which doesn't have a weakness..
not only you want a cheap one.. so a clone.. you want it not to brick your 3DS, which the Gateway is doing every thing its power to do so which copies its flashcart.
even Superman has a weakness.
gateway is the only non clone , if you stick to b1 or 1.2 you will be fine
ok then cheapest non clone one... (even the gateway causes brick...)
that's pretty deepyou are asking for a superhero which doesn't have a weakness..
but even the gateway can cause brick right?